Check the contents of the following sysctls on each system:
net.inet.icmp.log_redirect: 0
net.inet.tcp.log_in_vain: 0
net.inet.tcp.log_debug: 0
net.inet.udp.log_in_vain: 0
The log_in_vain ones will log everytime a packet is received for a port that nothing is listening on (like port 23).
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